My dogs, jojo and tiny barks and lets me know if someone drives up , or if they hear someone outside . I had a little Beagle schnauzer named snoopy ,that saved my life ,9yrs ago. Snoopy attacked an intruder that had a knife . The man left real quick , when snoopy came after him . It surprised me when she did that cause she always liked strangers or anyone she got around . I thought that she would just lick a burglar to death if there was ever one that broke into my home , but she showed me a different dog !